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| dave rosenthal -5speed box https://www.ausmini.com/forums/viewtopic.php?f=5&t=59560 |
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| Author: | mickmini [ Sun Dec 13, 2009 9:56 pm ] |
| Post subject: | dave rosenthal -5speed box |
Hey Dave, just wondering if you had made any progress on the idea of sticking a modern 5 speed gearset in the mini gearbox? cheers michael |
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| Author: | david rosenthal [ Thu Dec 17, 2009 11:14 am ] |
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that project has been shelved and I am working on a 6 speed sequential gear box in to a remote case. The gear clusters are going to be either out of honda or kwaka 1000's and I am matching up the std reverse gear to mesh on to the 1st gear like a std set-up. The bikes have netural between 1st and 2nd and in this postion I am going to use the std selector to engage reverse. Just have to wait until I get home to finish it. Pity I could not have packed it in my bag and brought it with me. |
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| Author: | kuzzy [ Thu Dec 17, 2009 11:57 am ] |
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I'd be happy to test the box under a Nc race engine - just to test the durability hehehehe |
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| Author: | woodwormm [ Thu Dec 17, 2009 8:23 pm ] |
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i guess i'll be changing from rod to remote then! that is definitely one of your mods i'lll be in for david. |
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| Author: | blue_deluxe [ Fri Dec 18, 2009 12:03 am ] |
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Me likey, that under a bike head and turbo charged would be more than a little fun. |
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| Author: | david rosenthal [ Sun Dec 20, 2009 4:29 pm ] |
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Don't get too excited boys as the one I am building is for my T/C engine and it is going to be dry sumped. I am not looking at a set-up for a std engine at this stage as the modification is going to require the whole gut cut out of the box and two new frames welded in. The other thing is it will need a extra drop gear as the bike boxes drive in on one shaft and out on the other. If it all works on my engine then if some one wants to copy it I will post all the info. As with most of the mods I do they all take time and money , so I am at this stage n ot really interested in building them up. I am just concerntrating on trying to finish off the cars I have started. If someone else wants to do one then I am happy to give the info I have worked out so far. I can not see why it would not work as the bike gear sets are as strong or stronger than a mini. |
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| Author: | brett [ Mon Apr 05, 2010 2:16 pm ] |
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any updates? |
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| Author: | craig goss [ Mon Apr 05, 2010 5:44 pm ] |
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David's been away working for the last few months. So hopefully when he get back he will give you the updates. |
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| Author: | david rosenthal [ Tue Apr 06, 2010 11:33 am ] |
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just a little update. I got home from dampier and the new honda gear box just arrived from USA. I have not got the whole box assembled yet as I am now in tassie visiting my daughter and grand kids. I only had enough time to set-up my new tool/cutter grinding attatchment and do the spline on out put shaft to suit mini pinion. The gear set is out of a 09/10 honda cbr 1000 RR bike and the gear ratios are what I wanted for the eng/box package for my new project car.[After driving around the roads here and bringing back memories of the XC ford 351 I ran here I think next years targa tassie is looking good] 1st is 2.547 :1 and 6th is 1.1:1 so at least it will pull in top gear.The bike output shaft fits into the mini box with two new taper roller bearings. The bike shafts and gears are bigger than mini but the 6 gears fit into the same mounting points. The other input shaft has new end plates to take brgs and the new end plate carrys the drop gears running on double row angular contact brgs.The box is finished off with honda civic ATB diff/CVs and passat drive shafts. I have finished the basic fit up to the engine which is a 1275 block [-060" O/S] and fitted with 998 crank. The pistons have arrived so when I get home I can get it re-bored to 73mm and with 76mm stroke and SC14 blower it should be interesting. I have another gear set on order that is same 1st but 6th is .889:1 which would be more suitable to a cruising car but we will see how this one goes. |
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| Author: | simon k [ Tue Apr 06, 2010 1:00 pm ] |
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david rosenthal wrote: I have finished the basic fit up to the engine which is a 1275 block [-060" O/S] and fitted with 998 crank. The pistons have arrived so when I get home I can get it re-bored to 73mm and with 76mm stroke and SC14 blower it should be interesting.
now you're talking!! 
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| Author: | rehab1964 [ Tue Apr 06, 2010 1:31 pm ] |
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simon k wrote: david rosenthal wrote: I have finished the basic fit up to the engine which is a 1275 block [-060" O/S] and fitted with 998 crank. The pistons have arrived so when I get home I can get it re-bored to 73mm and with 76mm stroke and SC14 blower it should be interesting. now you're talking!! sorry to be thick.... what happens when you fit a 998 crank in a 1275? |
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| Author: | simon k [ Tue Apr 06, 2010 2:08 pm ] |
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rehab1964 wrote: simon k wrote: david rosenthal wrote: I have finished the basic fit up to the engine which is a 1275 block [-060" O/S] and fitted with 998 crank. The pistons have arrived so when I get home I can get it re-bored to 73mm and with 76mm stroke and SC14 blower it should be interesting. now you're talking!! sorry to be thick.... what happens when you fit a 998 crank in a 1275? big bore, short stroke like a motorbike engine. It'll be capable of very high rpm, which will really take advantage of the big volume blower (and breathing capacity of the bike head, David?) 73mm pistons on a standard 81.3mm stroke (1275) gives 1360cc, 73mm pistons on a 76mm stroke gives 1272cc - less capacity, but more capability when used in the right "package" (to quote Matt Read) |
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| Author: | drmini in aust [ Tue Apr 06, 2010 2:14 pm ] |
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So, how do we lose 1/4" in main bearing diameter so the S block can take the 998 crank?? A split bush?? 
I'd hunt up a Seth Efrikan 1098 crank instead, a la minicranks. Much stronger than a 998 one. |
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| Author: | simon k [ Tue Apr 06, 2010 2:18 pm ] |
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I'm sure David has a solution 
drmini in aust wrote: So, how do we lose 1/4" in main bearing diameter so the S block can take the 998 crank?? A split bush??
I was hunting for the measurements before but couldn't find anything for a 998 - what main journal size do A+ 998 cranks have? |
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| Author: | drmini in aust [ Tue Apr 06, 2010 3:16 pm ] |
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1.750" |
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